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Turning and milling combined processing

Turning and milling combined processing
Turning, milling complex development of CNC machining technology, CNC programming techniques also put forward higher requirements. This is also a key link that restricts turning and milling compound processing equipment in actual production applications. Due to the short application time of turning and milling compound processing into actual production, in the absence of professional compound processing solutions, it is usually to use general-purpose CAM software to plan part of the processing program. Then the technologists manually integrate the program to meet the requirements of the compound processing machine tool for the processing program. This kind of solution places very high demands on the CNC technologists. Compared with traditional numerical control programming technology, the programming difficulties of turning-milling compound machining are mainly reflected in the following aspects.

(1) Various types of craftsmanship. For CNC technicians, it is not only necessary to be able to master the programming methods of various machining methods such as CNC turning, multi-axis milling, and drilling. Moreover, the connection between CNC processes and the way of forward and backward tools need to be accurately defined. Therefore, when performing numerical control programming, it is necessary to have an intuitive understanding of the process model and the distribution of the machining allowance after the current process is processed, so as to facilitate the programming of the next process and the setting of advance and retreat tools.

(2) The serial and parallel sequence in the programming process must be determined strictly in accordance with the process route. When the parts are processed on the turning and milling compound machining center, the complete processing from the blank to the finished product can be realized. Therefore, the compilation result of the processing program must be consistent with the process route. At the same time, multi-channel parallel processing also needs to be comprehensively considered in the process of NC machining programming. It can be seen that in order to achieve efficient compound processing, a process solution integrating process-programming-simulation should be developed.

(3) The current general CAM software does not yet support certain functions of turning-milling compound processing. Compared with the conventional single equipment processing, the machine tool movement and processing functions of the combined turning and milling processing are much more complicated. The current general-purpose CAM software is not enough to fully support the programming of these advanced functions, such as online measurement, sawing, automatic feeding, and tailstock control. Therefore, programs compiled with general-purpose CAM software still require a lot of manual or interactive methods to be applied to automated turning-milling combined processing.

(4) Integration of CNC machining programs. At present, the NC programs after the general CAM software is compiled are independent of each other. In order to realize complex automated and complete machining such as turning and milling, it is necessary to integrate and integrate these independent machining programs. This integration must be guided by the process route of the parts. First determine which programs are parallel, and then determine the processing sequence of different process methods, and give accurate tool change, card replacement, benchmark conversion, and tool advance and retreat instructions.

It can be seen that it is very difficult to compile CNC programs for turning-milling compound processing, and the current general-purpose CAM software for turning-milling compounding processing still has many defects and deficiencies. In order to make up for these shortcomings, it is a more realistic solution to develop a special programming system suitable for product technology and compound processing equipment based on the existing general CAD/CAM software. This aspect reduces the repetitive investment in software purchases, and at the same time avoids defects such as inability to reuse process knowledge and complex staffing due to the inconsistent programming platform.
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